JP4744960B2 - Air bag device for head protection - Google Patents

Description

  The present invention relates to an airbag device for protecting a head that expands along a window of a side door at the time of a side collision or rollover (rollover) of an automobile.

  As described in JP-A-2004-148976, for example, as a head protecting airbag device capable of coping with a rollover from a side collision to a rollover, there is no problem when a side collision of the automobile is detected. And a structure that operates when a rollover is detected (Patent Document 1).

In the above conventional head protecting airbag device, when a side collision occurs, the upper inflation portion of the airbag is deployed and inflated to cover the inside of the window to protect the occupant's head, and then the rod-like inflation on the lower edge side A site is formed to protect the occupant during rollover.
JP 2004-148976 A

  However, in the above conventional head protecting airbag device, the upper inflating portion and the lower inflating portion are formed independently, and the inflating gas flows into the lower inflating portion from a different gas inlet than the upper inflating portion. Or the upper and lower inflatable parts communicate with each other and the inflator is connected only to the upper inflatable part. The inflator has a plurality of gas generating parts, Since the expansion gas is discharged from the gas generator and the expansion gas is discharged from a smaller number of gas generators at the time of side collision detection than at the time of rollover detection, the inflator is detected by detecting the side collision and rollover. Need to control.

  Moreover, although the lower inflating portion is formed to extend downward for rollover, the extension of the height of the inflating portion makes it difficult to protect the occupant's head in the OOP (Out of Position) region.

  The present invention solves the above-mentioned problem, and can cope with any trouble even if a vehicle shifts from a side collision to a rollover without detecting the side collision and the roll over and controlling the inflator. An object is to provide a head protecting airbag device.

For this purpose, the airbag device for protecting a head according to the present invention is configured such that an airbag stored in a folded state is inflated and deployed in a curtain shape along a side surface in an automobile by an inflation gas supplied from one inflator. A head protecting airbag device for protecting an occupant, wherein the airbag is disposed on an upper edge side at the time of completion of inflation and deployment, and is disposed on an upper edge side at the time of completion of inflation and deployment. A plurality of normal chambers whose deployment regions are divided so as to be inflated and deployed at an early stage, and disposed on the opposite side of the gas inlet with respect to the central portion of the airbag at the time of completion of the inflation and deployment; formed by arranged their scope normally chamber below the chamber, as inflated and deployed rollover after a side impact, the normal chamber inflow path of the gas is located above The addition to the usual chamber outside via at least, and a least one rollover chamber taken longer than the normal chamber, gas from the inflow path of the gas in the lower portion of the rollover chamber A single gas inlet to be introduced is formed with a restriction .

The airbag device for protecting a head of the present invention has a gas inflow path other than the normal chamber located above so that the rollover chamber is inflated and deployed with a delay at the time of rollover after a side collision . At least through the normal chamber, that is, at least through the normal chamber for side collision, the gas is introduced longer than the normal chamber and introduced into the lower part of the rollover chamber from the gas inflow path. Since a single gas inlet is formed with a throttle and a detour is provided in the gas introduction path in order to provide a time difference in deployment with a single inflator, it is possible to roll without extending the height of the expansion part. At the time of over, it can protect the passenger's head in the OOP (Out of Position) area and reduce injury to the passenger due to inflated deployment. That.

An example of an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of an airbag device for protecting a head according to an embodiment of the present invention upon completion of inflation and deployment. When the airbag 10 of the head protection airbag apparatus M is folded and disposed along the roof side portion from the front pillar to the rear pillar of the automobile, for example, when the automobile collides or rolls over (rolls over). For example, it expands and expands in the form of a curtain along the side of the passenger compartment, receives the heads of the front and rear passengers in the car, protects the heads, or opens the window and throws the passengers outside the car. To prevent that.

  The airbag 10 overlaps an inner sheet and an outer sheet facing the vehicle compartment side surface and the vehicle compartment, respectively, when inflation and deployment are completed, and these sheets are joined by the linear coupling portions 11 to 18 and the annular coupling portions 12a to 18a. Thereby, the gas introduction ports 20 and 21, the normal chambers 23 to 27, and 40 to 42, the rollover chamber 43, and the non-expandable portions 30 and 31 are formed.

  The gas introduction port 20 is formed at the rear pillar side end of the upper edge side of the airbag 10 when the inflation and deployment are completed, and the gas introduction port 21 is a front edge on the upper edge side of the airbag 10 when the inflation and deployment is completed. It is formed at the end on the pillar side. The gas inlet 20 and the gas inlet 21 are communicated with each other by an upper edge gas passage 22 formed at the upper edge of the airbag 10.

  In the embodiment of FIG. 1, the expansion gas supplied from the inflator is introduced from the gas introduction port 20 on the rear pillar side, but in another embodiment, only the gas introduction port 21 on the front pillar side may be used, In still another embodiment, the gas may be introduced only from the gas inlet formed near the center of the upper edge passage formed at the upper edge of the airbag.

  Most of the normal chambers are arranged on the upper edge side of the airbag 10 at the completion of the inflation and deployment so that the deployment region is divided so as to be inflated and deployed early at the time of a side collision. The normal chamber includes front normal chambers 23 and 24, central normal chambers 27, 40, 41 and 42, and rear normal chambers 25 and 26.

The linear coupling portion 11 is disposed so as to substantially circulate the airbag 10. The linear coupling portion 12 arranged on the gas inlet 21 side is formed in a substantially W shape, and thereby, three front normal chambers 23 arranged in parallel and a front normal chamber 24 are formed on the left side thereof (in FIG. 1). , Communicated with the upper edge gas passage 22.
An end portion of the linear coupling portion 12 is continuous with the annular coupling portion 12 a, and the annular coupling portion 12 a reinforces the end portion of the linear coupling portion 12.

  The linear coupling portion 13 is connected to the linear coupling portion 12 and arranged in a substantially ρ shape, whereby the non-inflatable portion 30 is formed at the center portion in the front-rear direction of the airbag 10. An end of the linear coupling portion 13 and a node between the linear coupling portion 12 are connected to an annular coupling portion 13a and an annular coupling portion 13b, respectively. The annular coupling portions 13a and 13b are connected to the linear coupling portion 13 respectively. Reinforces the ends and knots.

  A linear coupling portion 14 disposed on the gas introduction port 20 side and extending upward from a lower edge portion of the linear coupling portion 11 causes a rear-side normal portion of the airbag 10 to a rear pillar side end. A chamber 25 is formed. And the edge part of the said linear coupling part 14 is continued to the cyclic | annular coupling part 14a, and the cyclic | annular coupling part 14a reinforces the edge part of the linear coupling part 14. FIG.

  A linear coupling portion 15 is disposed in a substantially inverted σ shape on the front side at a distance from the linear coupling portion 14. As a result, a non-expandable portion 31 is formed, and a rear normal chamber 26 is formed between the linearly coupled portion 14. The rear normal chamber 25 and the rear normal chamber 26 communicate with the upper edge gas passage 22.

  The linear coupling portion 15 is connected to a substantially J-shaped linear coupling portion 16, and a central normal chamber 40 is formed by these. A node between the linear coupling portion 15 and the linear coupling portion 16 is continuous with the annular coupling portion 15a, and an end of the linear coupling portion 16 is continuous with the annular coupling portion 16a. Reference numeral 16a reinforces the node of the linear coupling portion 16 and the end portion.

  A linear coupling portion 17 extending upward from the lower edge portion of the linear coupling portion 11 is disposed in a substantially seven-character shape on the front side at a distance from the linear coupling portion 16. Thus, the central normal chamber 27 is formed. The central normal chamber 40 communicates with the upper edge gas passage 22 via the rear normal chamber 26 and the central normal chamber 27. An end portion of the linear coupling portion 17 is connected to the annular coupling portion 17 a, and the annular coupling portion 17 a reinforces the end portion of the linear coupling portion 17.

  The linear coupling portion 17 forms a central normal chamber 41 with the linear coupling portion 18. Both ends of the linear coupling portion 18 are connected to the annular coupling portions 18a and 18b. The expansion gas flows into the central normal chamber 41 for side collision from the gap between the annular coupling portion 17a and the annular coupling portion 18a.

Further, the central normal chamber 42 is formed under the non-expandable portion 30 and the annular coupling portion 18a, and further, the linear coupling portion 12, the annular coupling portion 13a, and the linear coupling portion 11 A rollover chamber 43 is formed below the normal chamber 23. Specifically, the rollover chamber 43 is formed in the range in which the front side normal chamber 23 is disposed under the front side normal chamber 23 formed in parallel by the substantially W-shaped linear coupling portions 12. The central normal chamber 42 communicates with the central normal chamber 41, and the rollover chamber 43 communicates with the central normal chamber 42. That is, the gas inflow path to the rollover chamber 43 passes through at least other normal chambers other than the front normal chamber 23 located above, specifically through the central normal chamber 41, Usually longer than chambers 23-27, 40-42. Further, a single gas inlet having a throttle is formed at the lower portion of the rollover chamber 43 through which the gas is introduced from the gas inflow path by the annular coupling portion 13a.

  Each of the linear coupling portions 11 to 18 and each of the annular coupling portions 12a to 18a airtightly couples the inner sheet and the outer sheet, and even if the inner pressure of the airbag 10 rises to a design upper limit pressure, It is formed by a strong coupling means (for example, stitching with a high-strength sewing thread, adhesion with an adhesive with high adhesive strength, or welding) so that the outer sheets do not separate from each other.

    It has the upper peripheral part 50 and the lower peripheral part 51 which do not let the gas for an expansion | swell flow so that the linear coupling | bond part 11 arrange | positioned so that the said airbag 10 may be circulated may be enclosed. A plurality of attachment portions 53 for attaching the airbag 10 to the roof side portion are formed on the upper edge side of the upper peripheral edge portion. A clamp 54 is fixed to the front pillar side of the lower peripheral edge 51 and is connected to a predetermined connecting portion in the automobile.

  In the head protecting airbag apparatus M having the airbag 10 configured as described above, when the automobile collides with the side, the inflator is activated and the inflation gas is supplied from the gas inlet 20 through the upper edge gas passage 22 to the normal chamber. 23 to 27, the upper edge side of the airbag 10 is expanded, and the normal chambers 40 to 42 are also expanded. The airbag 10 spreads downward in a curtain shape along the side surface in the automobile, and expands between the passenger of the automobile and the side surface of the passenger compartment. Usually, the expansion of the chambers 23 to 27 and 40 to 42 prevents the head of the occupant from being struck by the pillar or the window glass at the time of a side collision.

  At the time of rollover after the side collision, the expansion gas is supplied to the rollover chamber 43 in which the gas inflow path from the upper edge gas passage 22 is longer than the normal chamber. That is, the flow (supply) of the expansion gas is as follows: normal chambers (41, 42) → throttle (13a) → rollover chamber 43. As a result, the rollover chamber 43 expands behind the normal chambers 41 and 42 for side collision at the time of side collision. Therefore, there is a restriction (gas inlet) at the location of the annular coupling portion 13a, and the gas goes around and reaches the rollover chamber 43. Therefore, even if a rollover occurs after a side collision, an occupant in the OOP region It is possible to protect the head. The diaphragm formed in the lower part of the rollover chamber preferably has a width of about half or less of the cross-sectional area of the chamber.

It is a front view of the airbag device for head protection at the time of completion of inflation deployment concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air bag 20, 21 Gas inlet 30, 31 Non-inflatable part 23-27, 40-42 Normal chamber 43 Rollover chamber M Head protection airbag apparatus

Claims (1)

A head protection airbag device in which a folded and stored airbag is inflated and deployed in a curtain shape along a side surface in an automobile by an inflation gas supplied from a single inflator to protect an occupant. ,
The airbag is
A gas inlet formed on the upper edge side upon completion of the expansion and deployment;
A plurality of normal chambers that are arranged on the upper edge side at the time of completion of the expansion and deployment, and in which the expansion region is divided so as to expand and expand at an early stage in a side collision,
The roll after the side collision is disposed on the opposite side of the gas inlet with respect to the central portion of the airbag at the time of completion of the inflation and deployment, and is formed in the range of the normal chambers below the normal chambers. At least one rollover chamber having a gas inflow path longer than the normal chamber through at least the normal chamber other than the normal chamber located above so that the gas inflow path expands and expands when over When,
And a single gas inlet into which gas is introduced from the gas inflow path is formed with a throttle at a lower portion of the rollover chamber.

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